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| Parameter Item | Specification / Range |
| Core Performance | EN 124 D400 (400 kN test load) |
| Available Material | Ductile Iron QT500-7 |
| Applicable Standard | EN 124 |
| Casting Process | Sand Casting |
OEM / ODM
Custom from drawings, 3D models, or samples.
Casting
Focusing on the design, manufacturing processes, heat treatment techniques, and key quality control points for all types of standard and non-standard gears.
EN 124 D400 Ductile Iron Round Manhole Cover with Frame
This EN 124 D400 Ductile Iron Round Manhole Cover with Frame is manufactured from QT500-7 ductile iron by sand casting. It combines high strength, good toughness, corrosion resistance, and wear resistance with a matched cover-and-frame design and anti-theft locking structure. Suitable for urban arterial roads, highways, parking lots, and municipal utility projects. For custom specifications or a quotation, send us your drawings or dimensions, material requirements, surface marking requirements, and order quantity.
Product Description
This EN 124 D400 Ductile Iron Round Manhole Cover with Frame is a reliable casting solution for municipal sewage and drainage systems. Manufactured by sand casting using QT500-7 ductile iron, it offers high strength, good toughness, corrosion resistance, and wear resistance for heavy-traffic applications.
The cover and frame are supplied as a matched set. The cross-hatched anti-slip surface helps improve traction for pedestrians and maintenance personnel, while the cast-in “Sewage” marking identifies the intended pipeline application. The frame includes fixing holes and an anti-theft locking structure designed to reduce movement, rattling, and unauthorized opening. An asphalt-based anti-corrosion coating provides additional protection for installation in different climatic and service environments.
Produced for the EN 124 D400 load class, the standard configuration has a 750 mm diameter. Dimensions, material grades, surface markings, and structural details can be customized according to customer drawings or requirements. The product is suitable for municipal drainage, sewage systems, and underground utility infrastructure projects
Parameter Information
| Parameter | Specification / Range |
|---|---|
| Casting Process | Sand Casting |
| Material | Ductile Iron QT500-7 |
| Core Performance Rating | EN 124 Class D400 (400 kN Test Load) |
| Structural Design | Round Cover + Round Manhole Base (Frame), Supplied as a Complete Set |
| Size | Diameter: 750 mm |
| Surface Treatment | Anti-Corrosion Bitumen Coating |
| Applicable Standard | EN 124 |
| Functional Features | Settlement Resistance, Noise Reduction, Anti-Theft |
| Cover Pattern | Cross-Shaped Anti-Slip Pattern |
| Pipeline Marking | Cast-in “污” (Sewage) Marking |
| Annual Production Capacity (Factory Capability) | 50,000 Tons (All Casting Products) |
| Weight Range | Customized According to Drawings / Specifications |
| Dimensional Tolerance (Factory Capability) | CT8–CT10 (ISO 8062) |
| Machining Capability (Factory Capability) | CNC Turning, Milling, Boring, Drilling, and Precision Machining of Mating Surfaces |
| Heat Treatment (Factory Capability) | Annealing / Normalizing / Quenching + Tempering (Customized as Required) |
| Inspection Equipment (Factory Capability) | Spectrometer, Metallurgical Microscope, Hardness Tester, Universal Testing Machine, Manhole Cover Load Testing Machine |
| Delivery Documents | Material Test Report, Dimensional Inspection Report, Performance Test Report, Hardness Test Record |
Custom Casting Capability
Engineering Support
Casting structure evaluation and process design.
Casting-to-Machining
Integrated casting and CNC machining. Annual output: 50,000 tons.
Quality Documentation
Inspection reports with each delivery.
Production & Quality Process
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Raw Material Selection & Charging01
Scrap steel and iron auto-fed into furnaces, sorted by material grade.
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02
Pattern & Core Making
CNC-machined steel/aluminum patterns and sand-pressed foam cores for lost foam process.
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Melting03
Three furnaces alternate for continuous melting with manual and secondary slag removal.
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04
S Molding, Box Closing & Pouring
Sand-compacted molds closed and poured; foam cores vaporize as iron fills cavity.
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Cooling & Post-Processing05
Cooling, de-sanding, grinding, shot blasting, CNC finishing; optional painting and heat treatment.
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06
Inspection & Packaging
Spectral, dimensional, mechanical, and load testing; palletized with strapping and film.
Why Choose Us
Integrated Casting & Machining
In-house casting and CNC machining eliminate coordination overhead between foundry and machine shop, ensuring tighter dimensional control and faster turnaround from pattern to finished part.
Verified Quality Documentation
Every batch ships with material test reports, dimensional inspection records, and hardness data. Full traceability from incoming material to finished casting with retained samples per batch.
Stable Batch Consistency
Controlled melting parameters, real-time spectral analysis, and standardized molding procedures ensure consistent mechanical properties and dimensional accuracy across production batches.
Customization & Export Experience
Full customization of patterns, text, and reinforcing structures. Exported to 9 countries including Spain, Israel, Jordan, Egypt, Algeria, Malaysia, Thailand, Japan, and Mexico. 7.74M RMB export value in 2023.
Application Scenarios
Ductile Iron Round Manhole Covers are suitable for sewage inspection chambers on urban arterial roads, including locations near the curb. Designed for D400 heavy vehicular traffic, the high strength and toughness of QT500-7 ductile iron support stable long-term service in municipal road applications.
Widely used in underground drainage systems for industrial parks and factory roadways. Dimensions, surface markings, and material grades can be customized according to project requirements, helping support consistent installation and maintenance across industrial infrastructure projects.
Suitable for sewage inspection chambers in large parking lots, public plazas, and logistics zones. The wear and impact resistance of ductile iron helps the cover withstand frequent vehicle traffic, supporting long service life and lower maintenance requirements over the service cycle.
Applicable to new construction and renovation projects for municipal sewage networks. The matched cover-and-frame design facilitates installation and maintenance access. The asphalt-based anti-corrosion coating provides additional protection in underground environments, while customized markings, dimensions, and structural details can be supplied to match project requirements.
Frequently Asked Questions (FAQ)
Can you produce castings according to our drawings or samples?
Yes. We support OEM/ODM from 2D/3D drawings or physical samples, including material and machining customization.
What is the typical lead time for custom castings?
New samples usually ship in 25-45 days including pattern making, casting, and inspection. Volume schedules are confirmed after process freeze.
What are your main products?
Main products include ductile iron manhole covers, grates, textile machine parts, excavator bucket teeth, valve castings, automotive parts, and gear reducer housings, manufactured to GB/T 23858-2009 and GB/T 25628-2010. Materials cover gray iron, ductile iron, and cast steel.
Do you provide inspection reports with shipment?
Yes. Equipped with F20 spectrometer, metallographic microscope, hardness tester, universal testing machine, and manhole cover pressure tester. Chemical composition, dimensional, hardness, and material certificates included.
What is the MOQ for custom castings?
MOQ depends on casting complexity and tooling requirements. Sample orders are accepted. Contact us with your drawings for a specific quotation.
How is packaging handled? What about quality issues?
Castings are stacked on wooden pallets with strapping; premium painted products are wrapped with protective film. Packaging is customized to product size and shipping requirements. Quality issues are addressed within 48 hours with repair, replacement, or refund solutions.